WO2016186420A1 - Terminal de communication sans fil et procédé de communication sans fil pour une transmission multi-utilisateur en liaison montante - Google Patents

Terminal de communication sans fil et procédé de communication sans fil pour une transmission multi-utilisateur en liaison montante Download PDF

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Publication number
WO2016186420A1
WO2016186420A1 PCT/KR2016/005181 KR2016005181W WO2016186420A1 WO 2016186420 A1 WO2016186420 A1 WO 2016186420A1 KR 2016005181 W KR2016005181 W KR 2016005181W WO 2016186420 A1 WO2016186420 A1 WO 2016186420A1
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WIPO (PCT)
Prior art keywords
aid
resource unit
trigger frame
temporary
wireless communication
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PCT/KR2016/005181
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English (en)
Korean (ko)
Inventor
안우진
김용호
곽진삼
손주형
Original Assignee
주식회사 윌러스표준기술연구소
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Application filed by 주식회사 윌러스표준기술연구소 filed Critical 주식회사 윌러스표준기술연구소
Priority to KR1020207014723A priority Critical patent/KR102203133B1/ko
Priority to CN201680028955.5A priority patent/CN107637005B/zh
Priority to KR1020207001158A priority patent/KR102188794B1/ko
Priority to KR1020177033597A priority patent/KR102072283B1/ko
Publication of WO2016186420A1 publication Critical patent/WO2016186420A1/fr
Priority to US15/814,290 priority patent/US10512108B2/en
Priority to US16/663,321 priority patent/US10660136B2/en
Priority to US16/851,108 priority patent/US11153916B2/en
Priority to US17/339,941 priority patent/US11784743B2/en
Priority to US18/244,195 priority patent/US20230421285A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0006—Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0278—Traffic management, e.g. flow control or congestion control using buffer status reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA

Definitions

  • the temporary AID indicates a resource unit including response information for the terminal in the block response.
  • the temporary AID is selected from unused AIDs by the terminal in a corresponding basic service set (BSS).
  • BSS basic service set
  • the AID includes a first AID set composed of AIDs used for AID allocation of terminals, and a second AID set composed of AIDs not used for AID allocation of terminals, wherein the temporary AID is set to the first AID set. It is selected from unused AIDs.
  • the trigger frame sets at least one random access resource unit, and the temporary AID is assigned to the random access resource unit.
  • FIG. 3 is a block diagram showing the configuration of a station according to an embodiment of the present invention.
  • FIG. 7 illustrates a method of performing a distributed coordination function (DCF) using a request to send (RTS) frame and a clear to send (CTS) frame.
  • DCF distributed coordination function
  • FIG. 8 and 9 illustrate a hidden node protection method in a multi-user transmission process.
  • FIG. 10 shows a structure of a trigger frame according to an embodiment of the present invention.
  • FIG. 11 illustrates a configuration of a resource unit pattern according to an embodiment of the present invention.
  • 17 and 18 illustrate a multi-user uplink transmission method using a temporary AID allocation method according to the above-described embodiments.
  • FIG. 20 illustrates a buffer status report method using random access based multi-user uplink transmission according to an embodiment of the present invention.
  • an infrastructure BSS (BSS1, BSS2) is an access point (PCP / AP) that is a station that provides one or more stations (STA1, STA2, STA3, STA4, STA5), and a distribution service.
  • PCP / AP-2 PCP / AP-2
  • DS Distribution System
  • the plurality of infrastructure BSSs may be interconnected through a distribution system (DS).
  • DS distribution system
  • ESS extended service set
  • BSS3 shown in FIG. 2 is an independent BSS and does not include an AP, all stations STA6 and STA7 are not connected to the AP. Independent BSSs do not allow access to the distribution system and form a self-contained network. In the independent BSS, the respective stations STA6 and STA7 may be directly connected to each other.
  • the station 100 may include a processor 110, a transceiver 120, a user interface 140, a display unit 150, and a memory 160. .
  • the transceiver 120 may operate only one transceiver module at a time or simultaneously operate multiple transceiver modules according to the performance and requirements of the station 100.
  • each transmit / receive module may be provided in an independent form, or a plurality of modules may be integrated into one chip.
  • the user interface unit 140 includes various types of input / output means provided in the station 100. That is, the user interface unit 140 may receive a user input by using various input means, and the processor 110 may control the station 100 based on the received user input. In addition, the user interface 140 may perform an output based on a command of the processor 110 using various output means.
  • the processor 110 of the present invention may execute various instructions or programs and process data in the station 100.
  • the processor 110 may control each unit of the station 100 described above, and may control data transmission and reception between the units.
  • the processor 110 may execute a program for accessing the AP stored in the memory 160 and receive a communication setup message transmitted by the AP.
  • the processor 110 may read information on the priority condition of the station 100 included in the communication configuration message, and request a connection to the AP based on the information on the priority condition of the station 100.
  • the processor 110 of the present invention may refer to the main control unit of the station 100, and according to the embodiment, some components of the station 100, for example, a control unit for individually controlling the transceiver unit 120 and the like.
  • the station 100 shown in FIG. 3 is a block diagram according to an embodiment of the present invention, in which blocks shown separately represent logically distinguishing elements of a device. Therefore, the elements of the above-described device may be mounted in one chip or in a plurality of chips according to the design of the device. For example, the processor 110 and the transceiver 120 may be integrated into one chip or implemented as a separate chip. In addition, in the embodiment of the present invention, some components of the station 100, such as the user interface unit 140 and the display unit 150, may be selectively provided in the station 100.
  • FIG. 4 is a block diagram showing the configuration of an AP 200 according to an embodiment of the present invention.
  • the AP 200 may include a processor 210, a transceiver 220, and a memory 260.
  • a processor 210 may include a central processing unit (CPU) 210, a graphics processing unit (GPU), and a central processing unit (GPU) 210.
  • a transceiver 220 may include a central processing unit (GPU) 210, and a central processing unit (GPU) 210.
  • a memory 260 may include a processor 210, a transceiver 220, and a memory 260.
  • FIG. 4 overlapping descriptions of parts identical or corresponding to those of the station 100 of FIG. 3 will be omitted.
  • the AP 200 includes a transceiver 220 for operating a BSS in at least one frequency band.
  • the transceiver 220 of the AP 200 may also include a plurality of transceiver modules using different frequency bands. That is, the AP 200 according to the embodiment of the present invention may be provided with two or more transmit / receive modules of different frequency bands, such as 2.4 GHz, 5 GHz, and 60 GHz.
  • the AP 200 may include a transmission / reception module using a frequency band of 6 GHz or more and a transmission / reception module using a frequency band of 6 GHz or less.
  • the scanning step is a step in which the STA 100 obtains access information of a BSS operated by the AP 200.
  • a passive scanning method for obtaining information by using only a beacon message S101 periodically transmitted by the AP 200, and a STA 100 requests a probe to the AP.
  • the 802.1X based authentication step S111 and the IP address obtaining step S113 through DHCP may be performed.
  • the authentication server 300 is a server that processes 802.1X-based authentication with the STA 100 and may be physically coupled to the AP 200 or may exist as a separate server.
  • the terminal performing the WLAN communication performs carrier sensing before checking data to check whether the channel is occupied. If a wireless signal of a predetermined intensity or more is detected, it is determined that the corresponding channel is busy, and the terminal delays access to the corresponding channel. This process is called clear channel assessment (CCA), and the level for determining whether a corresponding signal is detected is called a CCA threshold. If a radio signal having a CCA threshold or higher received by the terminal uses the terminal as a receiver, the terminal processes the received radio signal. On the other hand, if a wireless signal is not detected in the corresponding channel or if a wireless signal having a strength smaller than the CCA threshold is detected, the channel is determined to be idle.
  • CCA clear channel assessment
  • FIG. 7 illustrates a method of performing a distributed coordination function (DCF) using a request to send (RTS) frame and a clear to send (CTS) frame.
  • DCF distributed coordination function
  • each terminal having data to be transmitted performs a backoff procedure by decreasing the backoff counter (or a backoff timer) of a random number assigned to each terminal after the time of AIFS.
  • the transmitting terminal having the expired backoff counter transmits a Request to Send (RTS) frame to inform that the terminal has data to transmit.
  • RTS Request to Send
  • the STA1 having the advantage in the competition with the minimum backoff may transmit the RTS frame after the backoff counter expires.
  • the RTS frame includes information such as a receiver address, a transmitter address, and a duration.
  • the CTS frame includes information such as a receiver address and a duration.
  • the receiver address of the CTS frame may be set to be the same as the transmitter address of the corresponding RTS frame, that is, the address of the transmitting terminal STA1.
  • the transmitting terminal STA1 receiving the CTS frame transmits data after the time of SIFS.
  • the receiving terminal AP transmits an acknowledgment (ACK) frame after the time of SIFS to inform that the data transmission is completed.
  • ACK acknowledgment
  • the transmitting terminal considers the data transmission successful.
  • a response frame is not received within a preset time
  • the transmitting terminal considers that data transmission has failed.
  • neighboring terminals that receive at least one of an RTS frame and a CTS frame during the transmission process set a network allocation vector (NAV) and do not perform data transmission until the set NAV expires.
  • the NAV of each terminal may be set based on the duration field of the received RTS frame or CTS frame.
  • the transmitting terminal STA1 which transmits the RTS frame, considers that data transmission is impossible, and receives a new random number to participate in the next competition.
  • the newly allocated random number may be determined within the range (2 * CW) of twice the previously set random number range (competition window, CW) as described above.
  • one wireless communication terminal may simultaneously transmit data to a plurality of wireless communication terminals. Also, one wireless communication terminal can receive data from a plurality of wireless communication terminals at the same time. For example, multi-user downlink transmission in which an AP simultaneously transmits data to a plurality of STAs, and multi-user uplink transmission in which a plurality of STAs simultaneously transmit data to the AP may be performed. have.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • MIMO Multi Input Multi Output
  • multi-user uplink transmission may be performed based on competition of a plurality of STAs for a specific resource unit. For example, when the AID field value for a specific resource unit is set to a specific value (eg, 0) that is not assigned to the STA, the plurality of STAs may attempt random access (RA) for the corresponding resource unit. . Accordingly, there is a need for a resource allocation method for multi-user uplink transmission based on random access of a plurality of STAs.
  • a specific value eg, 0
  • FIG. 8 and 9 illustrate a method of protecting a hidden node in a multi-user transmission process.
  • NAV configuration of terminals not participating in data transmission is necessary.
  • the duration field of the simultaneous CTS frame 320 is set based on the period until the downlink data transmission of the AP and the response frame transmission of the STAs are completed.
  • neighboring terminals of STA1 and STA2 configure the NAV until the end of the DL-OFDMA session based on the duration field of the simultaneous CTS frame 320.
  • FIG. 9 illustrates a hidden node protection method in uplink OFDMA (UL-OFDMA) transmission.
  • UL-OFDMA uplink OFDMA
  • the STAs are allocated resource units through the MU-RTS frame 312 transmitted by the AP, and transmit the UL data frame 332 through the allocated resource units.
  • 9 illustrates an embodiment in which STA1 and STA2 transmit UL-OFDMA data to an AP, respectively.
  • the AP receives an UL data frame 332 transmitted by the STAs, and transmits a multi-STA block ACK (M-BA) 342 correspondingly.
  • M-BA multi-STA block ACK
  • STAs allocated resource units during the UL-OFDMA transmission transmit a simultaneous CTS frame 322 after SIFS from the reception of the MU-RTS frame 312, and UL data after xIFS from the transmission of the concurrent CTS frame 322.
  • Send frame 332 since the STAs that transmit the simultaneous CTS frame 322 may transmit UL data without transmitting / receiving switching, xIFS may be set to a shorter time than SIFS.
  • the protection field 412 indicates whether the corresponding trigger frame 400 is an MU-RTS frame.
  • the protection field 412 is set to 1
  • the trigger frame 400 is an MU-RTS frame
  • the terminals receiving the trigger frame 400 set the NAV based on the duration field of the trigger frame 400.
  • the protection field 412 is set to 0
  • the trigger frame 400 is a basic trigger frame, and the trigger frame 400 is not used for NAV setting of neighboring terminals.
  • the up / down indication field 414 indicates whether the corresponding trigger frame 400 triggers multi-user uplink data transmission or multi-user downlink data transmission. Transmission and reception operations of UEs after trigger frame 400 transmission and simultaneous CTS frame transmission may be performed based on the up / down indication field 414.
  • the up / down indication field 414 is illustrated as being included in the MAC header of the trigger frame 400, but the present invention is not limited thereto.
  • the uplink / downlink indication field may be included in the PHY preamble of the transmitted packet, for example, HE-SIG-A. In this case, the up / down indication field may indicate whether the corresponding packet is an uplink packet or a downlink packet.
  • the resource unit pattern consists of a combination of at least one resource unit, and each resource unit has a size of 26-tones, 52-tones or 106-tones. According to an embodiment, each resource unit pattern may consist of at least three to nine resource units. If a pattern number is specified in the resource unit pattern field 416, the trigger frame 400 may include as many user information fields 420 as the number of resource units included in the pattern. In this case, the AID field 422 for each user inserted into the user information field 420 sequentially corresponds to each resource unit of the corresponding resource unit pattern.
  • Pattern 1 consists of nine 26-tone resource units. At this time, up to nine AIDs may be allocated to each resource unit. Patterns 2 through 7 consist of one 52-tone resource unit and seven 26-tone resource units. In this case, up to eight AIDs may be allocated to each resource unit. Patterns 8-18 consist of two 52-tone resource units and five 26-tone resource units. In this case, up to seven AIDs may be allocated to each resource unit. Patterns 19 through 23 consist of three 52-tone resource units and three 26-tone resource units. At this time, up to six AIDs may be allocated to each resource unit. Pattern 24 consists of four 52-tone resource units and one 26-tone resource unit. At this time, up to five AIDs may be allocated to each resource unit.
  • Pattern 25 and Pattern 30 consist of one 106-tone resource unit and five 26-tone resource units. At this time, up to six AIDs may be allocated to each resource unit. Patterns 26 through 28 and 31 through 33 consist of one 106-tone resource unit, one 52-tone resource unit, and three 26-tone resource units. At this time, up to five AIDs may be allocated to each resource unit. Pattern 29 and Pattern 34 consist of one 106-tone resource unit, two 52-tone resource units, and one 26-tone resource unit. At this time, up to four AIDs may be allocated to each resource unit. Pattern 35 consists of two 106-tone resource units and one 26-tone resource unit. At this time, up to three AIDs may be allocated to each resource unit.
  • each resource unit of the resource unit pattern can be simplified if frequency selectivity is not taken into account when allocating STAs to each resource unit of a 20 MHz channel.
  • each resource unit of the resource unit pattern may be arranged in order of size.
  • the central resource unit of the 20 MHz channel is fixed to 26-tones in size.
  • both resource units are composed of a combination of at least one of 26-tone, 52-tone, and 106-ton, and the resource units of both are arranged in size order. In this case, as shown in FIG. 12, a total of nine resource unit patterns may be defined.
  • Pattern 1 consists of nine 26-tone resource units. At this time, up to nine AIDs may be allocated to each resource unit.
  • Pattern 2 consists of one 52-tone resource unit and seven 26-tone resource units. In this case, up to eight AIDs may be allocated to each resource unit.
  • Pattern 3 consists of two 52-tone resource units and five 26-tone resource units. In this case, up to seven AIDs may be allocated to each resource unit.
  • Pattern 4 consists of three 52-tone resource units and three 26-tone resource units. At this time, up to six AIDs may be allocated to each resource unit.
  • Pattern 5 consists of four 52-tone resource units and one 26-tone resource unit. At this time, up to five AIDs may be allocated to each resource unit.
  • Pattern 6 consists of one 106-tone resource unit and five 26-tone resource units. In this case, up to seven AIDs may be allocated to each resource unit.
  • Pattern 7 consists of one 106-tone resource unit, one 52-tone resource unit, and three 26-tone resource units. At this time, up to five AIDs may be allocated to each resource unit.
  • Pattern 8 consists of one 106-tone resource unit, two 52-tone resource units, and one 26-tone resource unit. At this time, up to four AIDs may be allocated to each resource unit.
  • Pattern 9 consists of two 106-tone resource units and one 26-tone resource unit. At this time, up to three AIDs may be allocated to each resource unit.
  • the resource unit pattern includes at least one 26-tone resource unit and may be configured of at least three to nine resource units.
  • the resource unit pattern field may have a size of 6 bits.
  • the resource unit pattern field may be simplified to a size of 4 bits.
  • the 106-tone resource unit may be replaced with a 102-tone resource unit or a 104-tone resource unit according to the arrangement of the pilot subcarrier and the data subcarrier.
  • a temporary AID may be used for a specific resource unit in a multi-user uplink transmission process.
  • a probe request and / or an association request may be transmitted through multi-user uplink transmission based on random access. That is, STAs not assigned an AID may transmit a probe request or a join request to the AP through a random access resource unit in a multi-user uplink transmission process. After the multi-user uplink transmission is completed, the AP transmits response information about the request of the STA through a block response.
  • the AIDs are not assigned to the STAs that transmit the request to the AP, there is a need for a method for the STAs to identify response information about themselves in the block response.
  • FIG. 14 illustrates a structure and a resource unit pattern of a trigger frame according to an embodiment of the present invention.
  • FIG. 14 is an example for explaining a temporary AID allocation method to be described below.
  • FIG. 14A illustrates a structure of a trigger frame and
  • FIG. 14B illustrates a resource unit pattern.
  • portions that are the same as or corresponding to those of FIGS. 10 to 13 will not be repeated.
  • a pattern number of a resource unit pattern composed of resource units of 106-tone, 26-tone, 52-tone, 26-tone, and 26-tone is y, and (106-tone: STA1, 26-tone: STA2, 52-tone: STA3, 26-tone: STA4, 26-tone: STA5).
  • the value of the resource unit pattern field 416 of the trigger frame is set to 'y'.
  • AID fields corresponding to STA1, STA2, STA3, STA4, and STA5 are sequentially inserted into each user's AID field of the user information field 420 of the trigger frame.
  • FIG. 15 illustrates a resource allocation method for multi-user uplink transmission based on random access according to an embodiment of the present invention.
  • the pattern 1 of FIG. 14 is allocated to the resource unit pattern of the primary channel and the pattern y of FIG. 14 is allocated to the resource unit pattern of the secondary channel.
  • FIG. 15B illustrates an embodiment of a method for displaying a user information field of a trigger frame for the channel of FIG. 15A.
  • the AID field value of the trigger frame indicating the random access resource unit may be set to zero. That is, when the AID field value of the trigger frame for a specific resource unit is 0, the STAs may attempt random access to the corresponding resource unit. STAs that have succeeded in random access may receive response information through a block response transmitted by the AP. However, when there are a plurality of resource units allocated for random access, each STA needs a method for identifying response information for the corresponding STA in the block response.
  • a temporary AID may be used to identify response information for each STA in the block response.
  • the temporary AID is selected from unused AIDs in the corresponding BSS. Therefore, the temporary AID has a different value from the AID assigned to each STA in the BSS.
  • a value selected from a range of 0 to 2007 may be used for the AID of the terminal, and a value after 2008 is not assigned to the AID of the terminal. That is, the first AID set is composed of AIDs used for AID allocation of terminals, and the second AID set is composed of AIDs not used for AID allocation of terminals.
  • a temporary AID may be selected from the second AID set. In this case, the first AID set may include AIDs from 0 to 2007, and the second AID set may include AIDs after 2008.
  • temporary AIDs having a value increased by one each from 2008 are allocated to the second through fourth resource units, the sixth resource unit, and the eighth through ninth resource units which are random access resource units of the primary channel. That is, 2008, 2009, and 2010 are assigned to the second to fourth resource units, 2011 is assigned to the sixth resource unit, and 2012 and 2013 are assigned to the eighth to ninth resource units, respectively.
  • UL-OFDMA is performed through a plurality of channels, a different value may be assigned to each channel for the temporary AID used for the block response, or a temporary AID may be independently assigned to each channel.
  • the first resource unit and the third resource unit which are the random access resource units of the subchannel, may be assigned to the temporary AIDs 2014 and 2015, respectively, after the temporary AID allocated to the primary channel.
  • 2008 and 2009 may be allocated as temporary AIDs to the first resource unit and the third resource unit of the subchannel independently of the primary channel, respectively.
  • FIG. 15C illustrates another embodiment of a method for displaying a user information field of a trigger frame for the channel of FIG. 15A.
  • the AID field value of the trigger frame indicating the random access resource unit may be set to the temporary AID value determined as described above.
  • the AP delivers response information for each STA through a block response using the temporary AID selected as described above.
  • the above-described temporary AID selection method is an embodiment of the present invention, and the present invention is not limited thereto.
  • the temporary AID may be selected not only in the second AID set but also in the first AID set. That is, an unused AID not allocated to the STA of the BSS in the first AID set may be selected as the temporary AID.
  • FIG. 16 illustrates a resource allocation method for multi-user uplink transmission based on random access according to another embodiment of the present invention.
  • the same or corresponding parts as those of the embodiment of FIG. 15 will be omitted.
  • the configuration of the resource unit of the primary channel is the same as that of FIG. 15A. However, in the subchannel, pattern 1 including nine 26-tone resource units is used, and all resource units are set as random access resource units.
  • a designated AID is allocated to the first resource unit of the primary channel, and the second to fourth resource units are configured as random access resource units.
  • 2008 which is the largest value among consecutively assigned temporary AID values, may be inserted into the AID field of the trigger frame in order to reduce the length of the trigger frame, and thus the display of 2008 and 2009 may be omitted.
  • the STAs may attempt to randomly access a total of three resource units by estimating that two temporary AIDs are omitted in advance when obtaining a 2010 as a temporary AID value for the second resource unit.
  • the temporary AID is specified to STAs through a trigger frame and may be used for identifying response information of a block response corresponding to multi-user uplink transmission.
  • FIG. 17 illustrates an embodiment in which an OFDMA block response is transmitted in response to multi-user uplink transmission.
  • the AP transmits a trigger frame 400 for triggering multi-user uplink data transmission, and the STAs receive the trigger frame 400.
  • the trigger frame 400 may include a common information field 410 and a user information field 420, and at least one AID field value of the user information field 420 may be set as a temporary AID. STAs may obtain a temporary AID in the received trigger frame 400.
  • Each STA transmits the multi-user uplink data 500 in response thereto.
  • Each STA selects at least one resource unit among resource units designated by the trigger frame and transmits the multi-user uplink data 500.
  • the resource unit to which the multi-user uplink data 500 is transmitted may include a random access resource unit.
  • at least one resource unit to which the multi-user uplink data 500 is transmitted may be assigned a temporary AID of the above-described embodiment.
  • the AP receives the multi-user uplink data 500 transmitted by the STAs and transmits the OFDMA block response 600 in response thereto.
  • STAs that transmit the multi-user uplink data 500 receive the OFDMA block response 600.
  • the STA may obtain response information for the corresponding STA in the OFDMA block response 600 based on the temporary AID.
  • the HE-SIG-B of the OFDMA block response 600 may include temporary AID information allocated to at least one resource unit.
  • FIG. 18 illustrates an embodiment in which a multi-STA block response (M-BA) is transmitted in response to multi-user uplink transmission.
  • M-BA multi-STA block response
  • the AP transmits the aforementioned trigger frame 400 and the STAs receive the trigger frame 400.
  • STAs may obtain a temporary AID in the received trigger frame 400.
  • STAs that receive the trigger frame 400 transmit the multi-user uplink data 520 correspondingly.
  • At least one resource unit to which the multi-user uplink data 520 is transmitted may be assigned a temporary AID of the above-described embodiment.
  • the STAs confirm the response information in the M-BA 620 based on the temporary AID of the resource unit that has performed the multi-user uplink data 520 transmission.
  • the plurality of STAs may transmit the multi-user uplink data 520 to the same resource unit corresponding to the same temporary AID. Accordingly, the STA checks the per-STA information field corresponding to the temporary AID of the corresponding STA in the M-BA 620 and checks whether the MAC address of the per-STA information field matches the MAC address of the corresponding STA. do. If the MAC address of the per-STA information field matches the MAC address of the STA, the STA determines that the multi-user uplink data 520 is successfully transmitted. However, if the MAC address of the per-STA information field does not match the MAC address of the STA, the STA determines that the multi-user uplink data 520 transmission has failed.
  • STAs that attempt UL-OFDMA random access compete to obtain transmission opportunities.
  • the STAs select a random number within a preset range as an ODMA (OFDMA BackOff) counter and perform a random access connection based on the selected OBO counter.
  • STAs decrement their OBO counters by the number of resource units allocated for random access every trigger frame transmitted. That is, when N resource units are allocated to random access, STAs may reduce the OBO counter by up to N in one competition process.
  • STAs whose OBO counter value is less than or equal to the number of resource units currently allocated for random access may perform random access.
  • the STAs randomly select a resource unit allocated for random access and perform random access transmission. An STA that does not obtain a random access opportunity in the contention process may attempt random access by repeating the aforementioned OBO counter decrement process when the next trigger frame is transmitted.
  • each item represents an access category classified according to the priority of data and a transmission probability corresponding thereto.
  • AC_VO represents a voice access category
  • AC_VI represents a video access category
  • AC_BE represents a best effort access category
  • AC_BK represents a background access category.
  • STAs attempting random access allocate different probability values according to an access category of data to be transmitted to perform differential access. That is, STAs that have acquired a random access transmission opportunity perform random access transmission with a specified probability according to an access category of data to be transmitted by the corresponding UE. The STA having data of an access category having a high probability value increases the probability of random access transmission.
  • the STAs receive the trigger frame indicating the random access, the STAs determine whether to perform the random access access based on the probability determined according to the access category of the data in the buffer of the corresponding UE.
  • the AP may transmit a congestion probability P_c having a value between 0 and 1 through a trigger frame.
  • P_c a congestion probability
  • STAs receiving the trigger frame perform random access transmission based on a product of a probability P determined according to an access category and a congestion probability P_c set by the AP.
  • the congestion probability P_c may be set to a lower value as the traffic in the BSS increases.
  • the AP may set the P_c value in consideration of the number of collisions in a single user (SU) and multi user (MU) transmission up to the current time point.
  • the multi-user uplink transmission STAs sharing the same 20MHz band are required to transmit the L-SIG part redundantly. Accordingly, the AP may estimate how many STAs attempted transmission when random access multi-user uplink transmission is performed each time. The AP may use the additional information together to set the P_c value.
  • each STA may perform random access transmission using a transmission probability table having an access category and a congestion index of data.
  • the AP may transmit the congestion index information corresponding thereto instead of the congestion probability P_c, and the STA may select a transmission probability from the table based on the received congestion index information and the access category information.
  • Congestion information according to the above embodiments may be inserted into a common information field of a trigger frame.
  • FIG. 19 illustrates a control method of multi-user uplink transmission based on random access according to an additional embodiment of the present invention.
  • a rectangular box represents an existing access terminal
  • a circular box represents a new access terminal.
  • the solid line box indicates a terminal performing random access transmission
  • the dotted line box indicates a terminal suspending random access transmission based on the aforementioned transmission probability.
  • the number of random access resource units is set to six.
  • FIG. 19A illustrates a situation in which seven STAs have an OBO counter of 6 or less in a situation where 6 resource units are selected as random access resource units.
  • the seven STAs select a random resource unit among six random access resource units to perform random access transmission. Since the number of STAs performing random access transmission is larger than the number of random access resource units, collision occurs in at least one resource unit.
  • FIG. 19B illustrates a situation in which STAs perform random access transmission based on the transmission probability of the above-described embodiment.
  • Each STA selects a transmission probability based on at least one of an access category and a congestion degree, and determines whether to perform random access transmission based on the selected transmission probability.
  • three of seven STAs having an OBO counter of less than 6 decide to suspend random access transmission. Accordingly, the remaining four STAs perform random access transmission through six random access resource units, and the collision probability of the random access transmission is lowered.
  • the OBO scaling method may reduce or increase the random access attempt rate of STAs. If there are many empty resource units for which random access transmission has not been performed in the previous multi-user uplink transmission, the AP reduces the scaling factor to a value less than or equal to 1 to determine the number of STAs that attempt random access access to the corresponding multi-user uplink transmission. Can be increased. Conversely, if there are many resource units that have collided during the previous multi-user uplink transmission, the AP may increase the scaling factor to a value of 1 or more to reduce the number of STAs that attempt random access access to the multi-user uplink transmission. .
  • FIG. 19 (c) shows a situation in which the scaling factor is set to 0.5.
  • Existing access terminals previously having OBO counters of 0, 1, 3, 4, 7 and 9 have final OBO counters of 0, 0, 1, 2, 3 and 4 after the adjustment, respectively.
  • new access terminals previously having OBO counters of 1, 2, 5, and 8 have final OBO counters of 0, 1, 2, and 4, respectively, after adjustment.
  • a total of 10 STAs having an OBO counter of less than 6 perform random access transmission based on the adjusted OBO counter.
  • the scaling factor may be calculated based on the transmission record up to the previous time point as in the above-described congestion probability P_c.
  • the scaling factor may be inserted into the common information field of the trigger frame and transmitted to each STA.
  • FIG. 20 illustrates a buffer status report method using random access based multi-user uplink transmission according to an embodiment of the present invention.
  • the AP In order for the AP to select the multi-user uplink STAs, the AP must know the buffer status information of the STAs in advance. In the non-legacy WLAN system, the AP may induce the STA to transmit a buffer status report by designating the STA through a trigger frame. In addition, even if the STA is not induced to the trigger frame, the STA having an uplink transmission opportunity for the AP may transmit a buffer status report together with the uplink data. The buffer status information is inserted into the QoS control field of the MAC header and transmitted to the AP. However, STAs that are not designated by the AP and have no uplink transmission opportunity for the AP cannot transmit buffer status information.
  • any number of STAs may perform buffer status report transmission using random access based multi-user uplink transmission. Since the trigger frame for the random access buffer status report targets an unspecified number of STAs, the AID field of the user information field of the trigger frame may be set to a predefined AID value.
  • the predefined AID may be an AID designated for the random access buffer status report.
  • an AID indicating multi-user uplink transmission based on random access may be used.
  • the duration field is set based on the length of QoS data / Null frame based on a specific Modulation and Coding Scheme (MCS). Since the AP cannot know in advance the channel environment of the STAs transmitting the random access buffer status report, the MCS of the trigger frame may be set to the lowest MCS or to a MCS previously designated for the random access buffer status report.
  • the buffer status report transmitted by the plurality of STAs may have the same data size, and the resource unit pattern for the random access buffer status report may be configured of resource units of the smallest unit.
  • STAs receiving the trigger frame may identify a trigger of the random access buffer status report based on the predefined AID or the duration field value.
  • STAs with uplink data transmit a buffer status report on any resource unit.
  • the buffer status report may be sent in QoS data / null format.
  • a 1-bit identifier for the random access buffer status report may be inserted in the common information field of the trigger frame.
  • the buffer status report may be transmitted with upstream data.
  • STAs that transmit the random access buffer status report may selectively transmit uplink data in the buffer based on the duration field information of the trigger frame.
  • the STA may fragment and transmit the upstream data of the buffer based on the duration field information of the trigger frame.
  • a predetermined AID may be used to identify it or an additional 1-bit identifier may be inserted for each user information field.
  • the present invention has been described using the WLAN communication as an example, the present invention is not limited thereto and may be equally applicable to other communication systems such as cellular communication.
  • the methods, apparatus, and systems of the present invention have been described in connection with specific embodiments, some or all of the components, operations of the present invention may be implemented using a computer system having a general hardware architecture.
  • Embodiments of the present invention described above may be implemented through various means.
  • embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.
  • the method according to the embodiments of the present invention may be implemented in the form of a module, a procedure, or a function that performs the functions or operations described above.
  • the software code may be stored in memory and driven by the processor.
  • the memory may be located inside or outside the processor, and may exchange data with the processor by various known means.

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Abstract

La présente invention concerne un terminal de communication sans fil et un procédé de communication sans fil pour une planification efficace de transmission de liaison montante multi-utilisateur. À cet effet, la présente invention concerne un terminal de communication sans fil et un procédé de communication sans fil l'utilisant, le terminal de communication sans fil comprenant : une unité d'émission/réception pour émettre/recevoir des signaux sans fil ; et un processeur pour commander le fonctionnement du terminal de transmission sans fil. L'unité d'émission/réception reçoit une trame de déclenchement pour déclencher la transmission de données de liaison montante multi-utilisateur, transmet des données de liaison montante multi-utilisateur correspondant à la trame de déclenchement reçue, et reçoit une réponse de bloc correspondant aux données de liaison montante multi-utilisateur, et le processeur acquiert un identifiant d'association (AID) temporaire en provenance de la trame de déclenchement reçue, et acquiert des informations de réponse relatives au terminal dans la réponse du bloc sur la base de l'AID temporaire.
PCT/KR2016/005181 2015-05-15 2016-05-16 Terminal de communication sans fil et procédé de communication sans fil pour une transmission multi-utilisateur en liaison montante WO2016186420A1 (fr)

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KR1020207014723A KR102203133B1 (ko) 2015-05-15 2016-05-16 다중 사용자 상향 전송을 위한 무선 통신 단말 및 무선 통신 방법
CN201680028955.5A CN107637005B (zh) 2015-05-15 2016-05-16 用于多用户上行链路传输的无线通信终端和无线通信方法
KR1020207001158A KR102188794B1 (ko) 2015-05-15 2016-05-16 다중 사용자 상향 전송을 위한 무선 통신 단말 및 무선 통신 방법
KR1020177033597A KR102072283B1 (ko) 2015-05-15 2016-05-16 다중 사용자 상향 전송을 위한 무선 통신 단말 및 무선 통신 방법
US15/814,290 US10512108B2 (en) 2015-05-15 2017-11-15 Wireless communication terminal and wireless communication method for multi-user uplink transmission
US16/663,321 US10660136B2 (en) 2015-05-15 2019-10-24 Wireless communication terminal and wireless communication method for multi-user uplink transmission
US16/851,108 US11153916B2 (en) 2015-05-15 2020-04-17 Wireless communication terminal and wireless communication method for multi-user uplink transmission
US17/339,941 US11784743B2 (en) 2015-05-15 2021-06-05 Wireless communication terminal and wireless communication method for multi-user uplink transmission
US18/244,195 US20230421285A1 (en) 2015-05-15 2023-09-08 Wireless communication terminal and wireless communication method for multi-user uplink transmission

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US20200245375A1 (en) 2020-07-30
US10660136B2 (en) 2020-05-19
US11153916B2 (en) 2021-10-19
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US20200059973A1 (en) 2020-02-20
US10512108B2 (en) 2019-12-17
KR102072283B1 (ko) 2020-02-03
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CN107637005B (zh) 2021-06-04
CN113452493A (zh) 2021-09-28
US20180077735A1 (en) 2018-03-15
CN113452494A (zh) 2021-09-28
KR102203133B1 (ko) 2021-01-15
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US11784743B2 (en) 2023-10-10
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